pyrocantha growth habit
I am helping my sister landscape her northern Kentucky (zone 6)yard. She is on a steep hill. Her front yard, which is north facing toward the Ohio river, is a parking pad and an eight foot decorative block retaining wall in rosy brown tones. It looks like a fortress - monolithic and imposing. I'd like to soften it with a cascading plant. My first choice would be pyrocantha with a orange-red berry in winter. Can it be trained to grow DOWNWARD? The pavement comes right up to the wall so no place to plant it at the base of the wall.
Climbing Hydrangia was suggested but is at best a second choice. It seems too delicate and out of character for this facade but it can be trained to grow downward. Any suggestions?